Normalize caption to string and add birdcall (label→caption)

README.md

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+---
+dataset_info:
+  features:
+  - name: audio
+    dtype:
+      audio:
+        decode: false
+  - name: caption
+    dtype: string
+  - name: source
+    dtype: string
+  splits:
+  - name: train
+    num_bytes: 9576458.0
+    num_examples: 20
+  download_size: 9425069
+  dataset_size: 9576458.0
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*
+---

data/train-00000-of-00001.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:6ed5cd41cbf9049c5b0766733cff9279f72bb12eabb9bb9d0c7dd69d97a144fa
+size 9425069